O'Neill, 58, who works for the Clinton Chamber of Commerce, bought the ticket for a Jan. 6 Powerball drawing. He told Iowa Lottery staffers he didn't think to check the results until a couple days afterward when a chamber receptionist pointed out an article in the local newspaper.

"She said, 'Read this article about the idiot that hasn't claimed his ticket.' So I read it and noticed where the ticket was bought," O'Neill said. "I thought, 'Gee, I better look at my ticket.' That's when I said, 'I think I won.'"

Then he called his wife, Diane, 58, who thought he was pulling a prank.

O'Neill said his wife told him to "quit horsing around. I'm watching Oprah."